Method and apparatus for automatically enhancing the foliage display of a
color signal includes providing the color signal in multiplexed form having alternating
first and second components, the first component being substantially aligned with
a flesh tone color space axis, the second component being substantialy aligned
with a green tone color space axis. A de-multiplexing unit separates the first
and second components to provide a first de-multiplexed component substantially
aligned with the flesh tone axis and a second de-multiplexed component substantially
aligned with the green tone axis. A processing unit generates from the de-multiplexed
components a green tone enhancement control signal for increasing green tone contrast
of the color signal; and a modifying unit modifies the magnitude of the multiplexed
color signal by applying the multiplexed color signal and the green tone enhancement
control signal to a multiplier to provide a modified multiplexed output signal
at an output having enhanced foliage contrast. In an examplary embodiment, the
green enhancement control signal and a flesh tone enhancement control signal are
applied to a common multiplier thereby advantageously providing both flesh tone
and foliage enhancement with an absolute minimum of circuitry for the combined functions.